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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32686f26cd1dba4a06cfe0806a1c8a1ca324ec13e710f219666cb618892c96cc' 
  AND token = 'HowoqhEPdgccXqr9SUT3XHfmpDcOha+QSc09Go/0D+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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