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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0207d706e16ff63b15ba04cc696ce27a3113c8adcdc26894dabd3b80f1c6f359' 
  AND token = 'S3Tl8ab/NcocveZlrtQq5X9Todt1ffEO9ozccnOMASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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