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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65439ba565f0d55591ce03cbe95a3736b8512fd04288928d46627b20e8dd92a' 
  AND token = 'B8oJAvhrIrXTAbxZl92p4dq2ews46dZpPnzeReXtydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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