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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c0b4415f77111e25ac6f0abe35e8421e713d0155b5dc4e9927a59130384737' 
  AND token = 'TtipG25xioRgFvss8xGrZXC/dTvWGwHnOltKz1gpmSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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