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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb1c2b52984d535440d4f7d43b4aa38d7156b68109c834c760c137d2f849874' 
  AND token = 'vbG9d5C1KLaO4sk3D44t+yWbvgXf93eOsGKqB+454gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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