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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a964094f674e6eb5335e740414567a747a8167cae7c285eb68ae87e4dc29a055' 
  AND token = 'dnXtT32Z/KGTdLhyCTnpIgqV52pNIjaF1l+Kdu8Gu+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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