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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cf288e49f4a3d7e58ffa08ec5f6ca22040e4206f6d438cf88254dedd636128' 
  AND token = 'UBTBjR84n+zAO9g6tSv04SlDFXdlfR3hT5dqR2WeDbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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