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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4537c4decc9d2f5ed364b249100693bdb93e77764301c197ad09daa824a2d7' 
  AND token = 'muEpMwgGDeiwbfvmdGghFta8JPvJWnD09ww0KUY5K9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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