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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3bf79b4087153277114cd9a9f08a6ded08e2993c432bd35dc364f3a32d65d' 
  AND token = 'iC/yWDaG0MV+ocqiCScibQU2w6kto2ZqiHUjKgPusi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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