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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7d42765a803e42f9934b3e87965a62b62a01a69874c77ef1e636697b62f7ab' 
  AND token = 'JSatgwvWqd6rSnbO90ZsboEbJtUpf6iVbsZDQF7eins=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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