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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19d4cafcd14d43dacfa9d68a06b30764bc8c522ea36cd77ffb463a4c41edd83' 
  AND token = 'JijSqDDF4sDqXfdG5T+Olo3rKCOBQPr6KPX+tCIqpoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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