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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83772159b524db85a41151871f02518660cebb3a8db8e5985df36d088eba5ee' 
  AND token = 'YcIGEKbbkdpI+CCpYFcJsdMl3GMYSHXavZ0Oo9Qv4hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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