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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ced9ed6787be9130ce06d0f548eca0a01be5274e14dfea43911af0c62403a9' 
  AND token = 'LWd0NWiqh5eJZ5NGDOoz+cYZ9EF7VD8n4xlLIKBULg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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