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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c916e03e06c4f66a089ab21e4ac6570fd5be9c936ebffedcac55a7b5502904' 
  AND token = '1eD1EE/N+DFBBTwPMhJ61wS2Bg//JFuV5qA77rqRmKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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