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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdbb25df5b3c496448e28d8472a490827893ae14b6684b21c075fe817fb7fcf' 
  AND token = 'zH3TbBUrcFSYAl0P3S54igZ4BaFsXZ/B44dNTsWSUUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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