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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd6c04eb7ee0d4814fe9a6b7f00fe6718b709a0569adcd67b6ffe44af1d56ca' 
  AND token = 'l92XRAc3cy2+zNqa5HkYlkQsfN8kVJ3EKk2kMYlj/jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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