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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea179e6df7a3909d59c2b64c81c2af7d14f35e1359ab1b831582e029eb586a66' 
  AND token = 'uHdqNR075budj4bQyUdAKWKToGMo2VQ7CSMb+MMdC1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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