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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf16ac52cc4eae02b88a257e83d3b83b06c4893e1d2ac8f20be62f9e6d0ce1ab' 
  AND token = 'GWdZhxg+t2IUFjGj75+RgnmV2+WdvmRn8jrUpy7fhio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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