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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1199209c5b5dd0739f85ea9d750136cba99dc03e6ab5fbc0b1aea64f91894da2' 
  AND token = 'jO9EcD+SIJh6/ScrRY71hT6VBcx8SlU1+nfItlGBVbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}