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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7707e0a26e69cd40f057b9c3508421c840a38c713da05c19eb75c7d07811c25' 
  AND token = '88t2EnICdsIqgkoW1/LAvWGQrkYYZZzveXEsrTv5iGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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