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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cafbc0818f8e4edda7174f1546d4e0a688145e090e67fe6cb52f5172765cfa' 
  AND token = 'GO97RN4gegRbNsZ6QjMLCfbfXwRNVmDBavKxncm0QWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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