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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfd668913c2f6eeebb283a3ea85c04cfa7d13098e4763c2fa97a9747d9156d0' 
  AND token = 'hwbC3N4woKgwXVzGyuxt80WKgrSorNRgiNdi24vpYd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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