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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb97bdf4f1b587bca08702f6d99ecc349dd7a55e003dcdfa8db2d8e4cd131ee' 
  AND token = 'mofjv9yVeT8OGTwD5TQeDHs1B2YxBd5QzUkYym+5vlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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