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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b952ee4277b04cfa230b82245307ddb3c1090715cc9952e1312938354af70c' 
  AND token = '84bx4BLlKRprA9nfocYuUg4LSfj3fHqLojQ/S8V+ct4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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