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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050966677d6b7c9e38f4faaadc4cf47c8fe9d9b38a303b34e327765fe71374db' 
  AND token = 'yJDg4sE2A2lMapqOAaQpwF+F2zdXtfUyfLi/KMq/GEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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