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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab12c8396542da2ee8960e657f035f40e77a272b6aca5f8c6820f7f99ee49272' 
  AND token = 'afO41EZgwrzvlmRdxV+0hoy1bM7aor2LvotmuGnE9r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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