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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f853a7c44e1344ac249e03bd269aaddac6fbc08dc7211ff4d7547a0c28531c2f' 
  AND token = 'HLX8/hqFcELv0ohAMRRNvGBSX5lZV4cR9acDNzYWVvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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