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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8c8cfb44ca9aa59cfe79b307d854487eb814b720eec6bb8864731c9965c357' 
  AND token = 'JAcIkdFUuFcoWK91FQBnLzDqwxrwIe9Ql3tJOPXhUHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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