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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f9c739d8b7edc9c69f008a77c3e37cf22942265e6325783088e6c237165eda' 
  AND token = 'y6UJNylZL4Wen8OA4qeLntW7/vugOW/Tw4xKSD4KcgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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