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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1723b3ab0b5e310d8d886c4a95d6f86efee2db389cd300aae331300f04758b' 
  AND token = 'HRkp1PSucpkzjvMxazUG3qI//9l3mfFfL56Zyb7EeKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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