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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85ed28b2bf2f1110100df3d1760ebdff0f944fd8639b84db6b3282cb2d1fdaf' 
  AND token = 'NniDZ7kv+7SCpup3LxfDcRx09Q/tF9qXNnbgzixUNmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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