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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c785bdba55ec0464737b4e806906acb882b183a9872fb5ec7c8f39b02471061' 
  AND token = '2WtmPmPgWGmbNkTnMoFrjRvpufLuH0XmtoXYcs8+b7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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