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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400274071b4702a432194b0dbef8b4c3eb71e82eb021185a692cf12f523f9512' 
  AND token = 'r/HJtAy0rKMrmEg7pzbg3ZDL/1EAYKY4NjkmXxp/Z3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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