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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf4853a74e028715335acbff706c158e08f04da36110ad65c1989c81b0eee8a' 
  AND token = '37pOp/uZV1WE3CNjbMj1Cprf5DYLRV8dXLWDNafAkrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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