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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33583ca76880c9eedfb06bb654da2278f3794a58a11e68e8334e423cb4ba8ae' 
  AND token = 't5BYtKyk907B0FLnktV7oBxFCt+HXX9Nu1gXnSmvC2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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