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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfe4b33c3ef2bc004d4540c984515fd69c9dde0321b9c2c271e3ac5e21f6a77' 
  AND token = 'LMkv1oWWHuxrl8bgpeETknvO0k/qBwHxubBxHbcOwDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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