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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd6767894d762e3d577170fff2e4151f2a3aa3cb244c87443acef6e8509e66' 
  AND token = 'l7ghpShtrEtr1b9glI9hqYbVVsl5/xhu9Osz9sznzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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