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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd432c3c1b887945335118ec6ef409e89bc82f6fa96f53d78fe6802301d1e0e' 
  AND token = 'IVWOJ/e6UK9kmCy9UKwd8RaOILV2scYHh5mpW8qFy1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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