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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8a70c5d8adfe6e0e33bd624dc169a592eaef583086f5051b2db6fa3bddd103' 
  AND token = 'dgQEcwVJbtD2442JlAwAHSTCzIbkOvV7qyPNpG767u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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