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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36fdf041979be3a3b11b1b65b8b0448b0e5e2ee1ec038f8de625d690d91e26c' 
  AND token = 'h4t/rXb6Mi+wWfea6b0npCTPnj6iYS0Eqp0uOZ+3uok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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