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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad923aefa5221dc28215b6312db331a1df387df52800a50dfef4f02ff80fd6a' 
  AND token = '6hX+RO1GBLcHtkG84i/+/rpdhpyAkSCOvUrN2QYyQlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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