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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec3901a927b5abdb84ef19598881aac32096acca7bfb2a0ef4ca765d1be98a7' 
  AND token = 'o8QPNRxoB5D9LNg9jQdYPUbvqb2FgwqdX2+ssHYoRn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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