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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef68d12a1bd4b8016d620413e6301dffd82e06afa0b748d09ca64db4aeaef87' 
  AND token = '8ifg4oMV6uV0kufFm97JchnDk3kVYNoxKhzUm3P3LJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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