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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0940f4fb4f8c7b7038c7cc58864cbda11ed2bfa9411515ea2b9d7d1cd2a777d6' 
  AND token = '5sLMkleg/NbtcluIF07uuniuWNlAjIP62rNR9fbvtjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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