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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c99cbb0497bb3a69eb10db72e10f31fc232f0ddc3454fd116b74b44070361e' 
  AND token = 'X60aDsZH8uqjAasy+6VUKIbx9Zn8a/wbuIK3JQD8v4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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