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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d41c6a5a8f39d43c2b139c99fef09a54e2b93fb970e1f8e7a34d6d415820485' 
  AND token = 'YDp+lo4S+qKcjKTnkfv8Fe0ERl4GSTE6QU0eQbUgCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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