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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9e2bd066989df3750217f9dddbc0f53ae6f859b53ad6c52d79ccd546bdf254' 
  AND token = '9Z+MfC3ousoMWweVfFptomwRA+qRT/4qq6GPnKxPGZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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