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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470d5164c422196567c54ff19e9595a96b3d06b9c55f7e72669874d5cc3f9247' 
  AND token = 'TTXab06YWdsPCL24e4kAzA90ndXrJxG+gzDYwEWak7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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