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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06707bd6ca416f9606bf953fd198d1f037109013fc5d8a148d1e75169b9d4cb0' 
  AND token = '6Z7uwpHqIh1agc1K9LQLD3yVi3Gg3cneCBhEya5uLxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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