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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa99531390d040018c4b08fc8748fc88e43a2f87317d6eb8a396695b06e6d414' 
  AND token = 'PSlyywB2Dge11wILS8ocnxKqMIn7Pa6OgCxlzVfHEjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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