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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395b09b1c19f46900d3e7b3abb940e13510e29c60be273310817d78e6d6cb08d' 
  AND token = '1Fevij5XDEIg93erHNwDvf8ovRnnduMThOhWz8SZaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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