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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b032b274d902b09a22996f1076c0ce86a9e2e35de153579fe00222b2bd7713' 
  AND token = 'HNR/X3qdh7GQ9bDFpQk2svS7snu+V4Y270B8Bspy+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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