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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f581baf5642f82bc5bf1a281c02da43fd749bbc8defa2c420b67dd6baea1f6' 
  AND token = 'qjvjkSg42IoSWPh2mh6Eq8JJdUbhjj5LniqSsBEE63s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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