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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b7fa8033c2ab55f05cd203f36893856e3c460c3ace0ffd08f8679a75041543' 
  AND token = 'fUT7CAF5dk9B0UmRviGJ9R2zx5BUECgmjEW44ngnrH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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