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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e03c72bde742e30747ce03fda48cffa04d5dc1262db5a6789e3fea15fa65ac' 
  AND token = 'mwFAs2qylCS3acTtIccnzcCSSK1jPGQj9tmWCG3is/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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