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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c127e5273a94f9d30bc0d1340d59a0a2be7687ba1178bfd4d6f8eb896c7b9d' 
  AND token = 'i6Hust02i/bHg4pqp9L25QTedc5wWkk47VaajFKv3w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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