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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ef219697f8f58c5178de0f6ab7b6b68b74c1f1b85ad9f80a1102ae4403e4cb' 
  AND token = '9VJ84hmONTscvv59UE31AGa1CkWmtmgWwkiZrHzLGTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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