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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044e34b0eeac8e2358e4dec3bc7017639568785a8cf04de5647584fe654034ec' 
  AND token = '8SDF3ORWVdIpdfTFTOgBFlQZN/K4ga+j9F6txEhPK+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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