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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9664c1c4dd6bc2ba77feb24cec8cb60d59a55353744b92135106c868c4dcadf7' 
  AND token = 'foNPj/D6JOiDI2Ak/M8Mo41k6WD9mU3/l5mx4WCGmAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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