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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7404eb8fee78ee00c60c989a7b3daab9f72cd442cd6e8e83b9128b9a1bd919d' 
  AND token = 'fA5Cervi73jyDNq28dUiFeWvoj47ofVbt7YirKBXiAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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