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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ff09f64c9dbfb61ee3775125151fd9c4f27027f2b963122216adb162b5e74' 
  AND token = '56Bcwktp4DVOANSfxF3Mbur9oXVKRGx+ubS1QDBOACQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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